Part six of the series on Yahoo! SportsYou could make a case that the AFC North has been the NFL's most successful division over the last five seasons and you may not get much of an argument.Unfortunately for the Cleveland Browns, they haven't been a part of that success.Since 2008, the franchise has lost 11 or more games each season. Now it's up to new head coach Rob Chudzinski to lead the team out of the AFC North basement. Still, it is a new season for these Browns. And it is here that we will take a look at five players who could be critical to the team's success this upcoming season. While in some cases the obvious will be stated, in other instances the focus will be on a newcomer to the team or a performer looking to rebound from a disappointing year. So here are five players to keep an eye on this season when it comes to the Cleveland Browns: